Year	Number of
1990	989.43
1991	1017.51
1992	1046.95
1993	1077.61
1994	1110.95
1995	1147.08
1996	1175.58
1997	1207.71
1998	1240.52
1999	1273.71
2000	1307
2001	1340.97
2002	1377.16
2003	1414.91
2004	1455.09
2005	1496.46
2006	1532.57
2007	1570.33
2008	1610.07
2009	1651.53
2010	1694.38
2011	1727.47
2012	1762.89
2013	1800.08
2014	1840.52
2015	1881.37
2016	1923.35